Stability analysis of a polymer coating processReportar como inadecuado

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1 CEMEF - Centre de Mise en Forme des Matériaux 2 JAD - Laboratoire Jean Alexandre Dieudonné

Abstract : A new coating process involving a short stretching distance 1 mm and a high draw ratio around 200 is considered. The resulting thin molten polymer film around 10 micrometers is set down on a solid primary film and then covered by another solid secondary film. In experimental studies, periodical fluctuation in the thickness of the coated layer may be observed. The processing conditions markedly influence the onset and the development of these defects and modeling will help our understanding of their origins. The membrane approach which has been commonly used for cast film modeling is no longer valid and two dimensional time dependent models within the thickness are developed in the whole domain upstream die and stretching path. A boundary-value problem with a free surface for the Stokes equations is considered and stability of the free surface is assessed using two different numerical strategies: a tracking strategy combined with linear stability analysis involving computation of leading eigenvalues, and a Level Set capturing strategy coupled with transient stability analysis.

Keywords : Stability coating process polymer modeling tracking capturing

Autor: Achraf Kallel - Elie Hachem - Yves Demay - Jean-François Agassant -



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